So I studied this thread for a couple of weeks and have slowly been retrofitting my 2010 E90 (which had the mulf2 but no idrive or telephone prep) with bluetooth. So far everything has gone smoothly. First I got the coding done to be sure bt would work in my car. Success! I paired my phone. Next, I bought the bt antenna, ordered the smb cable (something like $.30 with $5 shipping from China), found a place to order the mic and ran the cable (not as big a pita as I thought).
I think my biggest problem is going to be getting the fzd down to mount the mic when it comes in. I searched and can't really find a description of how to get the thing out. I must be pretty stupid, 'cause no one else seems to have an issue with it, but I struggled for an hour today and gave up because I was getting frustrated & didn't want to break something. What obvious thing am I missing???